Tannerella forsythia is a type of bacteria that is commonly found in the human mouth. It is part of the normal oral microbiome but is also associated with periodontal disease, which affects the gums and supporting structures of the teeth. This bacterium can contribute to inflammation and tissue destruction when it overgrows. Research has shown that Tannerella forsythia plays a role in the development of dental plaque and can interact with other bacteria in the mouth. Understanding its behavior and effects is important for improving oral health and preventing gum disease.